package jforgame.demo.utils;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class IpAddrUtil {

    public static String getInnetIp() throws SocketException {
        String localip = null;// 本地IP，如果没有配置外网IP则返回它
        String netip = null;// 外网IP
        Enumeration<NetworkInterface> netInterfaces;
        netInterfaces = NetworkInterface.getNetworkInterfaces();
        InetAddress ip = null;
        boolean found = false;// 是否找到外网IP
        while (netInterfaces.hasMoreElements() && !found) {
            NetworkInterface ni = netInterfaces.nextElement();
            Enumeration<InetAddress> address = ni.getInetAddresses();
            while (address.hasMoreElements()) {
                ip = address.nextElement();
                if (!ip.isSiteLocalAddress()
                        && !ip.isLoopbackAddress()
                        && !ip.getHostAddress().contains(":")) {// 外网IP
                    netip = ip.getHostAddress();
                    found = true;
                    break;
                } else if (ip.isSiteLocalAddress()
                        && !ip.isLoopbackAddress() && !ip.getHostAddress().contains(":")) {// 内网IP
                    localip = ip.getHostAddress();
                }
            }
        }
        if (netip != null && !netip.isEmpty()) {
            return netip;
        } else {
            return localip;
        }
    }

}
